🎉 First commit

Author: Holger Lösken

.github/dependabot.yml

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+version: 2
+
+updates:
+
+  - package-ecosystem: "composer"
+    commit-message:
+      include: "scope"
+      prefix: "composer"
+    directory: "/src/php"
+    labels:
+      - "dependency"
+    open-pull-requests-limit: 10
+    schedule:
+      interval: "daily"
+    versioning-strategy: "increase"
+
+  - package-ecosystem: "github-actions"
+    commit-message:
+      include: "scope"
+      prefix: "github-actions"
+    # default location of `.github/workflows`
+    directory: "/"
+    labels:
+      - "dependency"
+    open-pull-requests-limit: 10
+    schedule:
+      interval: "daily"

.github/workflows/tests.yml

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+name: Tests
+on: [push]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ['8.0']
+        dependency-version: [prefer-stable]
+    name: P${{ matrix.php }} - ${{ matrix.dependency-version }}
+    steps:
+      - name: Checkout code
+        uses: actions/[email protected]
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/[email protected]
+        with:
+          path: ~/.composer/cache/files
+          key: dependencies-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
+
+      - name: Install dependencies
+        run: composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction
+        working-directory: src/php
+
+      - name: Run tests
+        run: composer test
+        working-directory: src/php

README.md

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+A repository of coding challenges/tasks I came across in various job interviews.
+I mostly do backend programming in Go and PHP, so here you can find some solutions.
+
+The solutions to the tasks do not fulfill to be the shortest, fastest or cleanest solutions.
+
+## Tasks
+
+Each task should come with a solution plus some tests to verify.
+
+### Task 1
+
+Create a function `maskify` to mask digits of a credit card number with `#`.
+
+**Requirements:**
+* Do not mask the first digit and the last four digits
+* Do not mask non-digit chars
+* Do not mask if the input is less than 6
+* Return '' when input is empty
+
+### Task 2
+
+Create a function `number_to_ordinal` to create an ordinal number for a given input.
+Ordinal numbers in English have something like `st`, `nd`, `rd`, etc.
+
+**Requirements:**
+* Apply for number 1 to 1001... if that works any given number will do ;-)
+
+### Task 3
+
+Create a calculator for [Reverse Polish Notation](https://en.wikipedia.org/wiki/Reverse_Polish_notation).
+
+**Requirements:**
+* Support the mathematical operations for `+`, `-`, `*` and `/`
+* Check for invalid syntax, like `2 3+`. There is a space missing.
+* Return 0 (integer) when nothing is entered
+* Return the numeric value when no operand is given
+
+## Contribute
+
+Feel free to contribute. Use the issue list to propose new tasks or open PRs. Just provide proper tests 
+and description and requirements for the tasks.

src/php/composer.json

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+{
+    "name": "codedge/coding-challenges",
+    "author": "Holger Lösken <[email protected]>",
+    "require": {
+        "php": "^8.0",
+        "phpunit/phpunit": "^9.5"
+    },
+    "autoload-dev": {
+        "files": [
+            "t1/s1.php",
+            "t2/s1.php",
+            "t3/s1.php"
+        ],
+        "psr-4": {
+            "Tests\\": "tests/"
+        }
+    },
+    "scripts": {
+        "test": [
+            "./vendor/bin/phpunit"
+        ]
+    }
+}